Subtitle, or per-post info?

[Kaelon]

On my site, users have multiple personalities (one for poster, another for mod, and even another for admin) that right now they are using multiple accounts to maintain. I'd like to consolidate these accounts and merge them, and instead, find a way for users to select (at the time of posting) from a pull-down a list of "personalities" or "display names" that they have associated with their account, to appear alongside the particular post they are making.

Does anyone have any insight on any mods that do something like this? I was initially thinking a subtitle or other mod that would add information to a post, rather than pull information from a profile (since the information would be unique per-post).

Any thoughts/perspectives that you have would be much appreciated!